I think the potential transfer theory is the most plausible. Maybe he started thinking of transferring at some point in the fall? If so, it's too late to pull out for this semester, so he might as well stay and pick up some academic credits. Or maybe he's just undecided.
If he transfers mid-season, he would have 1 3/4 years of eligibility left at the new school. This year would count as a redshirt season. He wouldn't be eligible to play in the first semester at the new school (must spend a full year there before playing), but could play at some point in December 2014 or January 2015. As I understand it, if he played at all in 2013-2014, he'd be down to just one season of eligibility unless he could arrange a cheesy fake medical redshirt.
Of course, this is all just wild conjecture.
JJ said he's not playing this weekend but will be welcomed back when he's ready
It's bizarre. Transferring is obviously a big decision for a kid, but I can't see letting it drag out this long...but I can't come up with anything else that makes much sense either.
Facing some other sort of non-injury health issue and a considering redshirt year?